<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avater_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input v-model="loginForm.username" placeholder="请输入用户名" prefix-icon="iconfont icon-ziyuan"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input type="password" v-model="loginForm.password" placeholder="请输入密码" prefix-icon="iconfont icon-suo"></el-input>
                </el-form-item>
                <!-- 按钮区域 -->
                <el-form-item class="btns">
                   <el-button type="primary" @click="login">登录</el-button>
                   <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>
<script>

export default ({
    data(){
        return {
            // 这是登录表单的数据绑定对象
            loginForm: {
                username:'admin',
                password:'123456'
            },
            // 表单的验证规则对象
            loginFormRules: {
                // 验证用户名是否合法
                username:[
                    {required:true,message:"请输入登录名称",trigger:"blur"},
                    {min:3,max:15,message:"长度在3到15个字符",trigger:"blur"}
                ],
                // 验证密码是否合法
                password:[
                    {required:true,message:"请输入登录名称",trigger:"blur"},
                    {min:6,max:15,message:"长度在6到15个字符",trigger:"blur"}
                ]
            }
        }
    },
    methods: {
        // 点击重置按钮，重置登录表单
        resetLoginForm() {
            // this.loginForm.username = '',
            // this.loginForm.password = ''

            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async (valid)=>{
                if(!valid) return;
                const {data:res} = await this.$http.post('login',this.loginForm);
                if(res.meta.status!==200) return this.$message.error('登录失败！');
                this.$message.success('登录成功!');
                /*
                    1.将登录成功之后的token，保存到客户端的sessionStorage中
                        1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
                        1.2 token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
                */
                window.sessionStorage.setItem('token',res.data.token);
                // 2.通过编程式导航跳转到后台主页，路由地址是/home
                this.$router.push("/home")
            })
        }
    }
})
</script>

<style lang="less" scoped>
.login_container{
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #2b4b6b;
    height: 100%;
}
.login_box {
    position: relative;
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
}
.avater_box {
    position: absolute;
    top: -65px;
    left: 50%;
    transform: translateX(-75px);
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    background-color: #fff;
    img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
}
.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns {
    display: flex;
    justify-content: flex-end;
}
</style>
